Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 419 insertions, 0 deletions

diff --git a/third_party/rust/siphasher/src/sip.rs b/third_party/rust/siphasher/src/sip.rs
new file mode 100644
index 0000000000..db6656e121
--- /dev/null
+++ b/third_party/rust/siphasher/src/sip.rs
@@ -0,0 +1,419 @@
+// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! An implementation of SipHash.
+
+use core::cmp;
+use core::hash;
+use core::marker::PhantomData;
+use core::mem;
+use core::ptr;
+use core::slice;
+
+/// An implementation of SipHash 1-3.
+///
+/// See: <https://131002.net/siphash/>
+#[derive(Debug, Clone, Copy, Default)]
+pub struct SipHasher13 {
+    hasher: Hasher<Sip13Rounds>,
+}
+
+/// An implementation of SipHash 2-4.
+///
+/// See: <https://131002.net/siphash/>
+#[derive(Debug, Clone, Copy, Default)]
+pub struct SipHasher24 {
+    hasher: Hasher<Sip24Rounds>,
+}
+
+/// An implementation of SipHash 2-4.
+///
+/// See: <https://131002.net/siphash/>
+///
+/// SipHash is a general-purpose hashing function: it runs at a good
+/// speed (competitive with Spooky and City) and permits strong _keyed_
+/// hashing. This lets you key your hashtables from a strong RNG, such as
+/// [`rand::os::OsRng`](https://doc.rust-lang.org/rand/rand/os/struct.OsRng.html).
+///
+/// Although the SipHash algorithm is considered to be generally strong,
+/// it is not intended for cryptographic purposes. As such, all
+/// cryptographic uses of this implementation are _strongly discouraged_.
+#[derive(Debug, Clone, Copy, Default)]
+pub struct SipHasher(SipHasher24);
+
+#[derive(Debug, Clone, Copy)]
+struct Hasher<S: Sip> {
+    k0: u64,
+    k1: u64,
+    length: usize, // how many bytes we've processed
+    state: State,  // hash State
+    tail: u64,     // unprocessed bytes le
+    ntail: usize,  // how many bytes in tail are valid
+    _marker: PhantomData<S>,
+}
+
+#[derive(Debug, Clone, Copy)]
+struct State {
+    // v0, v2 and v1, v3 show up in pairs in the algorithm,
+    // and simd implementations of SipHash will use vectors
+    // of v02 and v13. By placing them in this order in the struct,
+    // the compiler can pick up on just a few simd optimizations by itself.
+    v0: u64,
+    v2: u64,
+    v1: u64,
+    v3: u64,
+}
+
+macro_rules! compress {
+    ($state:expr) => {{
+        compress!($state.v0, $state.v1, $state.v2, $state.v3)
+    }};
+    ($v0:expr, $v1:expr, $v2:expr, $v3:expr) => {{
+        $v0 = $v0.wrapping_add($v1);
+        $v1 = $v1.rotate_left(13);
+        $v1 ^= $v0;
+        $v0 = $v0.rotate_left(32);
+        $v2 = $v2.wrapping_add($v3);
+        $v3 = $v3.rotate_left(16);
+        $v3 ^= $v2;
+        $v0 = $v0.wrapping_add($v3);
+        $v3 = $v3.rotate_left(21);
+        $v3 ^= $v0;
+        $v2 = $v2.wrapping_add($v1);
+        $v1 = $v1.rotate_left(17);
+        $v1 ^= $v2;
+        $v2 = $v2.rotate_left(32);
+    }};
+}
+
+/// Load an integer of the desired type from a byte stream, in LE order. Uses
+/// `copy_nonoverlapping` to let the compiler generate the most efficient way
+/// to load it from a possibly unaligned address.
+///
+/// Unsafe because: unchecked indexing at `i..i+size_of(int_ty)`
+macro_rules! load_int_le {
+    ($buf:expr, $i:expr, $int_ty:ident) => {{
+        debug_assert!($i + mem::size_of::<$int_ty>() <= $buf.len());
+        let mut data = 0 as $int_ty;
+        ptr::copy_nonoverlapping(
+            $buf.get_unchecked($i),
+            &mut data as *mut _ as *mut u8,
+            mem::size_of::<$int_ty>(),
+        );
+        data.to_le()
+    }};
+}
+
+/// Load an u64 using up to 7 bytes of a byte slice.
+///
+/// Unsafe because: unchecked indexing at start..start+len
+#[inline]
+unsafe fn u8to64_le(buf: &[u8], start: usize, len: usize) -> u64 {
+    debug_assert!(len < 8);
+    let mut i = 0; // current byte index (from LSB) in the output u64
+    let mut out = 0;
+    if i + 3 < len {
+        out = load_int_le!(buf, start + i, u32) as u64;
+        i += 4;
+    }
+    if i + 1 < len {
+        out |= (load_int_le!(buf, start + i, u16) as u64) << (i * 8);
+        i += 2
+    }
+    if i < len {
+        out |= (*buf.get_unchecked(start + i) as u64) << (i * 8);
+        i += 1;
+    }
+    debug_assert_eq!(i, len);
+    out
+}
+
+impl SipHasher {
+    /// Creates a new `SipHasher` with the two initial keys set to 0.
+    #[inline]
+    pub fn new() -> SipHasher {
+        SipHasher::new_with_keys(0, 0)
+    }
+
+    /// Creates a `SipHasher` that is keyed off the provided keys.
+    #[inline]
+    pub fn new_with_keys(key0: u64, key1: u64) -> SipHasher {
+        SipHasher(SipHasher24::new_with_keys(key0, key1))
+    }
+
+    /// Get the keys used by this hasher
+    pub fn keys(&self) -> (u64, u64) {
+        (self.0.hasher.k0, self.0.hasher.k1)
+    }
+}
+
+impl SipHasher13 {
+    /// Creates a new `SipHasher13` with the two initial keys set to 0.
+    #[inline]
+    pub fn new() -> SipHasher13 {
+        SipHasher13::new_with_keys(0, 0)
+    }
+
+    /// Creates a `SipHasher13` that is keyed off the provided keys.
+    #[inline]
+    pub fn new_with_keys(key0: u64, key1: u64) -> SipHasher13 {
+        SipHasher13 {
+            hasher: Hasher::new_with_keys(key0, key1),
+        }
+    }
+
+    /// Get the keys used by this hasher
+    pub fn keys(&self) -> (u64, u64) {
+        (self.hasher.k0, self.hasher.k1)
+    }
+}
+
+impl SipHasher24 {
+    /// Creates a new `SipHasher24` with the two initial keys set to 0.
+    #[inline]
+    pub fn new() -> SipHasher24 {
+        SipHasher24::new_with_keys(0, 0)
+    }
+
+    /// Creates a `SipHasher24` that is keyed off the provided keys.
+    #[inline]
+    pub fn new_with_keys(key0: u64, key1: u64) -> SipHasher24 {
+        SipHasher24 {
+            hasher: Hasher::new_with_keys(key0, key1),
+        }
+    }
+
+    /// Get the keys used by this hasher
+    pub fn keys(&self) -> (u64, u64) {
+        (self.hasher.k0, self.hasher.k1)
+    }
+}
+
+impl<S: Sip> Hasher<S> {
+    #[inline]
+    fn new_with_keys(key0: u64, key1: u64) -> Hasher<S> {
+        let mut state = Hasher {
+            k0: key0,
+            k1: key1,
+            length: 0,
+            state: State {
+                v0: 0,
+                v1: 0,
+                v2: 0,
+                v3: 0,
+            },
+            tail: 0,
+            ntail: 0,
+            _marker: PhantomData,
+        };
+        state.reset();
+        state
+    }
+
+    #[inline]
+    fn reset(&mut self) {
+        self.length = 0;
+        self.state.v0 = self.k0 ^ 0x736f6d6570736575;
+        self.state.v1 = self.k1 ^ 0x646f72616e646f6d;
+        self.state.v2 = self.k0 ^ 0x6c7967656e657261;
+        self.state.v3 = self.k1 ^ 0x7465646279746573;
+        self.ntail = 0;
+    }
+
+    // Specialized write function that is only valid for buffers with len <= 8.
+    // It's used to force inlining of write_u8 and write_usize, those would normally be inlined
+    // except for composite types (that includes slices and str hashing because of delimiter).
+    // Without this extra push the compiler is very reluctant to inline delimiter writes,
+    // degrading performance substantially for the most common use cases.
+    #[inline(always)]
+    fn short_write(&mut self, msg: &[u8]) {
+        debug_assert!(msg.len() <= 8);
+        let length = msg.len();
+        self.length += length;
+
+        let needed = 8 - self.ntail;
+        let fill = cmp::min(length, needed);
+        if fill == 8 {
+            self.tail = unsafe { load_int_le!(msg, 0, u64) };
+        } else {
+            self.tail |= unsafe { u8to64_le(msg, 0, fill) } << (8 * self.ntail);
+            if length < needed {
+                self.ntail += length;
+                return;
+            }
+        }
+        self.state.v3 ^= self.tail;
+        S::c_rounds(&mut self.state);
+        self.state.v0 ^= self.tail;
+
+        // Buffered tail is now flushed, process new input.
+        self.ntail = length - needed;
+        self.tail = unsafe { u8to64_le(msg, needed, self.ntail) };
+    }
+}
+
+impl hash::Hasher for SipHasher {
+    #[inline]
+    fn write(&mut self, msg: &[u8]) {
+        self.0.write(msg)
+    }
+
+    #[inline]
+    fn finish(&self) -> u64 {
+        self.0.finish()
+    }
+}
+
+impl hash::Hasher for SipHasher13 {
+    #[inline]
+    fn write(&mut self, msg: &[u8]) {
+        self.hasher.write(msg)
+    }
+
+    #[inline]
+    fn finish(&self) -> u64 {
+        self.hasher.finish()
+    }
+}
+
+impl hash::Hasher for SipHasher24 {
+    #[inline]
+    fn write(&mut self, msg: &[u8]) {
+        self.hasher.write(msg)
+    }
+
+    #[inline]
+    fn finish(&self) -> u64 {
+        self.hasher.finish()
+    }
+}
+
+impl<S: Sip> hash::Hasher for Hasher<S> {
+    // see short_write comment for explanation
+    #[inline]
+    fn write_usize(&mut self, i: usize) {
+        let bytes = unsafe {
+            slice::from_raw_parts(&i as *const usize as *const u8, mem::size_of::<usize>())
+        };
+        self.short_write(bytes);
+    }
+
+    // see short_write comment for explanation
+    #[inline]
+    fn write_u8(&mut self, i: u8) {
+        self.short_write(&[i]);
+    }
+
+    #[inline]
+    fn write(&mut self, msg: &[u8]) {
+        let length = msg.len();
+        self.length += length;
+
+        let mut needed = 0;
+
+        if self.ntail != 0 {
+            needed = 8 - self.ntail;
+            self.tail |= unsafe { u8to64_le(msg, 0, cmp::min(length, needed)) } << (8 * self.ntail);
+            if length < needed {
+                self.ntail += length;
+                return;
+            } else {
+                self.state.v3 ^= self.tail;
+                S::c_rounds(&mut self.state);
+                self.state.v0 ^= self.tail;
+                self.ntail = 0;
+            }
+        }
+
+        // Buffered tail is now flushed, process new input.
+        let len = length - needed;
+        let left = len & 0x7;
+
+        let mut i = needed;
+        while i < len - left {
+            let mi = unsafe { load_int_le!(msg, i, u64) };
+
+            self.state.v3 ^= mi;
+            S::c_rounds(&mut self.state);
+            self.state.v0 ^= mi;
+
+            i += 8;
+        }
+
+        self.tail = unsafe { u8to64_le(msg, i, left) };
+        self.ntail = left;
+    }
+
+    #[inline]
+    fn finish(&self) -> u64 {
+        let mut state = self.state;
+
+        let b: u64 = ((self.length as u64 & 0xff) << 56) | self.tail;
+
+        state.v3 ^= b;
+        S::c_rounds(&mut state);
+        state.v0 ^= b;
+
+        state.v2 ^= 0xff;
+        S::d_rounds(&mut state);
+
+        state.v0 ^ state.v1 ^ state.v2 ^ state.v3
+    }
+}
+
+impl<S: Sip> Default for Hasher<S> {
+    /// Creates a `Hasher<S>` with the two initial keys set to 0.
+    #[inline]
+    fn default() -> Hasher<S> {
+        Hasher::new_with_keys(0, 0)
+    }
+}
+
+#[doc(hidden)]
+trait Sip {
+    fn c_rounds(_: &mut State);
+    fn d_rounds(_: &mut State);
+}
+
+#[derive(Debug, Clone, Copy, Default)]
+struct Sip13Rounds;
+
+impl Sip for Sip13Rounds {
+    #[inline]
+    fn c_rounds(state: &mut State) {
+        compress!(state);
+    }
+
+    #[inline]
+    fn d_rounds(state: &mut State) {
+        compress!(state);
+        compress!(state);
+        compress!(state);
+    }
+}
+
+#[derive(Debug, Clone, Copy, Default)]
+struct Sip24Rounds;
+
+impl Sip for Sip24Rounds {
+    #[inline]
+    fn c_rounds(state: &mut State) {
+        compress!(state);
+        compress!(state);
+    }
+
+    #[inline]
+    fn d_rounds(state: &mut State) {
+        compress!(state);
+        compress!(state);
+        compress!(state);
+        compress!(state);
+    }
+}